#include <bits/stdc++.h>
using namespace std;
int n;
const int N = 1010;
int a[N], f[N];

int main() {
	cin >> n;
	for (int i = 1; i <= n; ++i) {
		cin >> a[i];
	}
	for (int i = 1; i <= n; ++i) {
		f[i] = 1;
		for (int j = 1; j < i; ++j) {
			if (a[j] < a[i]) {
				f[i] = max(f[i], f[j] + 1);
			}
		}
	}
	int res = 0;
	for (int i = 1; i <= n; ++i) {
		res = max(res, f[i]);
	}
	cout << res;
	return 0;
}